Based on NCAR/NCEP reanalysis data, the intensity change of 0814 strong typhoon Hagupit is diagnosed. The results showed that the high SST of the Western Pacific is conducive to the generation of Haqupit, the offshore high SST of Zhejang, Fujian and Hainan contributes to the development and maintenance of Hagupit. At the TC genesis stage, the subtropical high stretches northward and westward, strengthens and maintains its intensity steadily. When the typhoon moves towards the subtropical high, the pressure gradient between them increases, the south easterly wind enables Hagupit to move northwest quickly and strengthen. When the TC entered the South China Sea, the subtropical high maintains and further strengthens westward, but the westerly trough moves eastward so that the typhoon moves northwestward and develops into a strong typhoon. The intensity change of Hagupit is affected by following factors. In the upper troposphere, the strong northeast wind on the eastern side of South Asia high transports high potential vorticity to the typhoon area, and makes Hagupit develop. In the lower troposphere , strong southwest monsoon provides adequate water sources and transports cyclonic relative vorticity to the typhoon zone, and then enables Haqupit to rapidly develop and maintain its strength.%应用中国台风网提供的“黑格比”台风定位及强度资料、NCAR/NCEP再分析资料及DISCOVER项目组的卫星遥感数据对0814号强台风“黑格比”的发展、维持阶段进行了诊断分析.结果表明:西北太平洋中部异常偏高的SST为“黑格比”的生成提供了有利的背景条件,浙闽沿海及海南岛沿海异常偏高的SST为“黑格比”的发展和维持提供了有利的环境条件；西太副高断裂为东西两个单体,“黑格比”移经这两个单体之间使其强度迅速增强；南亚高压东侧的强东北气流将高位涡向台风环流输送,使得台风得以增强发展；强劲的西南季风为“黑格比”提供了充足的水汽来源,并向台风环流输送了气旋性相对涡度带,使其得以快速发展并维持强度.
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